JP5634477B2 - Coil device - Google Patents

Description

  The present invention relates to a coil device used for a power supply device in an electric vehicle, a charging device thereof, and the like.

  For example, a coil device having a core such as a step-down transformer, a step-up transformer, a smoothing reactor, and a coil used for a power supply device in an electric vehicle, a charging device thereof, etc. is required to be small, but the coil having a core By downsizing the device, the amount of heat generated per unit volume increases, and the entire coil device may become hot.

  As a countermeasure to such a problem, for example, in Patent Document 1, the heat of the core is radiated to the casing through a heat dissipation rubber and a holding spring that fixes the core, which is a magnetic component of the transformer, to the casing. A method for suppressing the temperature rise of the transformer has been proposed.

JP 2007-305809 A

  The core disclosed in Patent Document 1 is radiated to the housing via a pressing spring. Here, the pressing spring needs to be made of, for example, spring steel in order to have a spring property. For this reason, there is a concern that the heat of the core cannot be sufficiently radiated to the casing because the heat transfer coefficient is poor as compared with a material such as copper or aluminum that is generally used as a member for heat dissipation. This is an obstacle to miniaturization of the transformer or coil.

  The present invention has been made in view of the above-described circumstances, and the first core thermally coupled to the metal casing and the first core are thermally and on the side far from the metal casing. An object of the present invention is to improve the heat dissipation efficiency of a core main body that is composed of a magnetically coupled second core and is built in the metal casing, and to reduce the size of the coil device.

The coil device according to the present invention includes a metal housing, a first core thermally coupled to the metal housing, and a thermal and magnetic side on the side far from the metal housing to the first core. A core body composed of a second core coupled to the core body and embedded in the metal casing, a winding wound around the core body and having the first core and the second core as a magnetic path, A heat dissipating plate in surface contact with the surface of the second core remote from the metal housing, and the heat dissipating plate elastically at the tip of the surface of the second core remote from the metal housing The heat dissipation plate has better thermal conductivity than the pressure spring, the heat dissipation plate is fixed by a single heat dissipation plate mount, and the heat dissipation plate rotates about the heat dissipation plate mount. The means for preventing this is the heat dissipation plate A coil device for use in vehicles provided beside the knots.

The present invention includes a metal housing, a first core thermally coupled to the metal housing, and a first core thermally and magnetically coupled to the first core on a side far from the metal housing. A core body composed of a second core and built in the metal casing; a winding wound around the core body and having the first core and the second core as a magnetic path; A heat dissipating plate in surface contact with the surface of the core far from the metal housing, and a holding spring that elastically presses the heat dissipating plate against the surface of the second core far from the metal housing at the tip. The heat radiating plate has better heat conductivity than the holding spring, the heat radiating plate is fixed by a single heat radiating plate mount, and the means for preventing the heat radiating plate from rotating about the heat radiating plate mount Is provided beside the heat dissipation plate mount Since that is the coil system for vehicle are, available large material elasticity pressing spring, but the spring properties is not to the heat radiation plate can be used with high thermal conductivity material, the first core and the second The heat dissipation efficiency of both cores can be improved, thereby realizing a small coil device for in- vehicle use .

It is a figure which shows Embodiment 1, and is an overhead view which shows an example of a structure of the transformer part of a power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 2, and is an overhead view which shows the other example of a structure of the trans | transformer part of a power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 3, and is an overhead view which shows the further another example of a structure of the trans | transformer part of a power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 4, and is an overhead view which shows the further another example of a structure of the trans | transformer part of a power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 5, and is an overhead view which shows the further another example of a structure of the trans | transformer part of a power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 5, and is an overhead view which shows an example of the shape of the presser spring of the transformer of the power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 6, and is an overhead view which shows the further another example of a structure of the trans | transformer part of a power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 6, and is an overhead view which shows an example of the shape of the thermal radiation plate of the transformer of the power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 7, and is an overhead view which shows the further another example of a structure of the trans | transformer part of a power supply device as an example of a coil apparatus. It is a figure which shows Embodiment 8, and is an overhead view which shows the further another example of a structure of the trans | transformer part of a power supply device as an example of a coil apparatus.

  A coil device according to an embodiment of the present invention described below is used, for example, in a power supply device mounted on an electric vehicle, for example, a transformer that steps down from about 300 V to about 12 V, a smoothing reactor for an in-vehicle DC-DC converter (power supply device). An example of a coil device used in a step-up transformer of a charging device of an electric vehicle / hybrid vehicle, etc. will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is an overhead view showing a transformer portion of the power supply device according to the first embodiment.

In FIG. 1, a transformer (a coil device having a core (hereinafter referred to as “transformer” in any of Embodiments 1 to 8)) is a transformer main body (a transformer main function comprising a winding and a core described later) A metal housing 1 having a built-in structure), an upper I core (hereinafter referred to as an “upper I core”) 2 as a second core to be a magnetic component of the transformer, and a magnetism of the transformer A lower E core (hereinafter referred to as “lower E core”) 3 that is a first core that is a component, a heat radiating plate 4 that has better thermal conductivity than a presser spring 7 to be described later, and the metal housing 1 are integrated. A heat dissipating plate holding column 5 for holding the heat dissipating plate 4, a screw (hereinafter referred to as “screw”) 6 that is a heat dissipating plate attachment for fixing the heat dissipating plate 4 and the heat dissipating plate holding column 5, and a holding spring 7 And one with the metal housing 1 A holding spring holding column 8 for holding the holding spring 7, a screw (hereinafter referred to as a “screw”) 9 that is a holding spring fixing the holding spring 7 and the holding spring holding column 8, and a winding It consists of the line 10.
A core body is constituted by the first core 3 and the second core 2 thermally and magnetically coupled to the first core on the side far from the metal housing 1. The core 3 and the second core 2 are made of, for example, ferrite, an amorphous alloy, a laminated silicon steel plate, or the like.

A pair of convex portions 12 is provided at the upper end of the heat dissipation plate holding column 5 for holding the heat dissipation plate 4 integrated with the metal casing 1. The pair of convex portions 12 penetrates the heat radiating plate 4 and prevents the heat radiating plate 4 from rotating in the horizontal direction about the screw 6 as an axis.

  Similarly, a pair of convex portions 13 is provided at the upper end of the holding spring holding column 8 for holding the holding spring 7 integrated with the metal casing 1. The pair of convex portions 12 penetrates the pressing spring 7 and prevents the pressing spring 7 from rotating in the horizontal direction about the screw 6 as an axis.

  In the transformer of the power supply device as shown in FIG. 1, when the energy of the electric power passing through the transformer increases, the upper I core 2 and the lower E core 3 generate heat. When the heat radiating plate 4 is not grounded, the heat of the upper I core 2 and the lower E core 3 is radiated to the metal housing 1 mainly from the bottom surface of the lower E core 3. Since the upper surface of the upper I core 2 is located at a portion farthest from the metal housing 1, the portion where the temperature is highest in the entire core including the upper I core 2 and the lower E core 3 is the upper I core 2. It is the upper surface.

  In the present embodiment, the heat radiating plate 4 is installed on the upper surface of the upper I core 2, and further, a holding spring 7 is installed so as to overlap the heat radiating plate 4, and the heat radiating plate 4 is pressed on the upper surface of the upper I core 2. The entire core including the upper I core 2 and the lower E core 3 is pressed against the metal casing 1.

  Here, the heat radiating plate 4 is made of a material having a high heat transfer coefficient such as copper. On the other hand, the holding spring 7 is made of a material having an appropriate spring property. That is, the heat radiating plate 4 is made of a material having better thermal conductivity than the holding spring 7. If the heat dissipation plate 4 is made of copper and processed into a spring shape to serve both as a heat dissipation function and a holding spring, the heat dissipation plate is made of copper with poor springiness. It is difficult to have a springiness.

  With the above configuration, the heat on the upper surface of the upper I core 2 is radiated to the support 5 for holding the heat radiating plate 4 and the metal housing 1 via the heat radiating plate 4. Further, since the heat radiating plate 4 is pressed against the upper surface of the upper I core 2 by the holding spring 7, the adhesion between the heat radiating plate 4 and the upper surface of the upper I core 2 is improved, the heat radiating efficiency is increased, and a small power supply device is provided. Coil devices such as transformers can be realized.

  Further, since the heat radiating plate 4 is pressed against the upper surface of the upper I core 2 by the presser spring 7, it is not necessary to give the heat radiating plate 4 a spring property, and the heat transfer rate as a material of the heat radiating plate 4 is higher than the presser spring 7. High copper material can be used. As a result, the heat generated on the upper surface of the upper I core 2 is efficiently radiated to the support column 5 for holding the heat radiating plate 4 and the metal casing 1, so that the heat radiating efficiency is improved and a coil device such as a transformer of a small power supply device can be obtained. realizable.

  Also, to provide a coil device such as a transformer or a coil of a power supply device that can use a material such as copper having a higher heat transfer coefficient than a holding spring as a heat radiating member of the core and at the same time can fix the core to the housing with sufficient strength. Can do.

In addition, the present embodiment includes a metal housing, a first core thermally coupled to the metal housing, and a thermal and magnetic side on the side far from the metal housing to the first core. A core body composed of a second core coupled to the core body and embedded in the metal casing, a winding wound around the core body and having the first core and the second core as a magnetic path, A heat dissipating plate in surface contact with the surface of the second core far from the metal housing, and a presser that elastically presses the heat dissipating plate against the surface of the second core far from the metal housing. A coil device provided with a spring.
Furthermore, the coil spring is characterized in that the pressing spring partially presses the heat radiating plate against a surface of the second core far from the metal casing at a plurality of locations.
Further, the coil device is characterized in that the shape of the holding spring is a finger shape, and the heat radiating plate is pressed against the surface of the second core far from the metal casing at the tip. .
Further, the coil device is characterized in that the attached portion of the heat radiating plate is attached to the metal casing.
Furthermore, the attached portion of the heat radiating plate is attached to the end of the heat radiating plate holding column integral with the metal housing on the side opposite to the metal housing by a heat radiating plate attachment. It is a coil apparatus characterized by these.
Furthermore, the attached portion of the heat radiating plate is one place at the end of the heat radiating plate, and the holding spring is located at the end of the heat radiating plate opposite to the attached portion. Is a coil device.
Further, the coil device is characterized in that the attached portion of the pressing spring is attached to the metal casing.
Furthermore, the attached portion of the presser spring is attached to the end of the presser spring holding column integral with the metal casing on the side opposite to the metal casing by a presser spring attachment. It is a coil apparatus characterized by these.
Furthermore, the heat radiating plate covers the entire surface of the second core on the side far from the metal casing.
Furthermore, the heat radiating plate is in contact with the entire surface of the surface of the second core on the side far from the metal casing.
Further, a metal casing, an upper core that is a magnetic part of a transformer or a coil, a lower core, a heat radiating plate, a screw that fixes the heat radiating plate and the metal casing, a pressing spring, and the pressing spring And a screw for fixing the metal casing, the transformer or coil of the power supply device, wherein the heat dissipating plate and the presser spring are arranged so as to overlap the upper core. A coil device such as a coil.

  In the above-described embodiment, the heat radiating plate 4 is fixed to the support column 5 for holding the heat radiating plate 4, but the fixing method of the heat radiating plate 4 is not limited to such a method. The shape of the heat radiating plate 4 is U-shaped so as to cover the entire core including the upper I core 2 and the lower E core 3, and the heat radiating plate 4 is directly fixed to the metal housing 1 by a fixing method. There may be.

  Further, in the present embodiment, the configuration of the core of the transformer of the power supply device has been described as a configuration in which the I core 2 is disposed in the upper portion and the E core 3 is disposed in the lower portion. For example, a configuration in which an E core is disposed in the upper portion and an I core is disposed in the lower portion, or a configuration in which the E core is disposed in the upper and lower portions may be employed.

Embodiment 2. FIG.
FIG. 2 is an overhead view showing a transformer portion of the power supply device according to the second embodiment.

  In FIG. 2, the heat radiating plate 4 has a claw-like part (hereinafter referred to as “claw-like part”) 11 that is a holding piece that holds the four sides of the upper I core 2. Other configurations are the same as those of the first embodiment.

  In the present embodiment, the heat radiating plate 4 is fixed by means of a screw 6 and a column 5 for holding the heat radiating plate 4 integrated with the metal housing 1. Further, the upper I core 2 is not moved in the horizontal direction by being held by the claw-like portion 11 provided on the heat radiating plate 4. Further, since it is pressed from the upper part of the upper I core 2 by the pressing spring 7, it does not move in the vertical direction.

  With the above configuration, the upper I core 2 can be fixed using only the heat radiating plate 4, so there is no need to separately add a fixing member for the I core 2, and the power supply device The assembly of the transformer is improved. In other words, by providing a claw-like portion (holding piece) for holding the upper core on the heat radiating plate, there is no need to separately provide a means for holding the upper core, and assembling property of a coil device such as a transformer or a coil of the power supply device is eliminated. Will improve.

  Moreover, this Embodiment is a coil apparatus characterized by the said heat radiating plate having a nail | claw-shaped part which covers the said upper core.

  In the above-described embodiment, the heat radiating plate 4 is fixed to the support column 5 for holding the heat radiating plate 4, but the fixing method of the heat radiating plate 4 is not limited to such a method. The plate 4 has a U-shape that covers the entire core including the upper I core 2 and the lower E core 3, and is a fixing method in which the heat radiating plate 4 is directly screwed to the metal housing 1. May be.

  In the present embodiment, the transformer core of the power supply device has been described as having a configuration in which an I core is disposed at the top and an E core is disposed at the bottom. However, the core configuration is limited to such a configuration. For example, a configuration in which an E core is disposed in the upper portion and an I core is disposed in the lower portion, or a configuration in which the E core is disposed in the upper and lower portions may be employed.

Embodiment 3 FIG.
FIG. 3 is an overhead view showing a transformer portion of the power supply device according to the third embodiment.

  In FIG. 3, the heat radiating plate 4 has a claw-like portion 11 that holds the upper I core 2 and the lower E core 3 so as to cover the four sides. Other configurations are the same as those of the first embodiment.

  In the present embodiment, the heat radiating plate 4 is fixed by means of a screw 6 and a column 5 for holding the heat radiating plate 4 integrated with the metal housing 1. Further, the upper I core 2 and the lower E core 3 are not moved in the horizontal direction by being held by the claw-like portions 11 provided on the heat radiation plate 4. Further, since it is pressed from the upper part of the upper I core 2 by the pressing spring 7, it does not move in the vertical direction.

  With the above configuration, the upper I core 2 and the lower E core 3 can be fixed using only the heat radiating plate 4, so that the I core 2 and the lower E core 3 are separately fixed. There is no need to add a member, and the assemblability of a coil device such as a transformer of the power supply device is improved. In other words, providing the heat dissipating plate with claw upper portions (holding pieces) for holding the upper core and the lower core eliminates the need to provide separate holding means for the upper core and the lower core, and allows the transformer, coil, etc. Assembling property of the coil device is improved.

Further, in this embodiment, the heat dissipation plate integrally includes a plurality of holding pieces that hold a plurality of locations on the side surface of the core that surrounds the surface of the second core that is far from the metal casing, The holding piece also holds a plurality of locations on the side surface of the core of the first core.
The heat radiating plate may have a claw-like portion that covers the upper core and the lower core.

In the present embodiment, as described above, the heat radiating plate 4 is fixed to the support column 5 for holding the heat radiating plate 4, but the fixing method of the heat radiating plate 4 is not limited to such a method. For example, the shape of the heat radiating plate 4 is U-shaped so as to cover the entire core including the upper I core 2 and the lower E core 3, and the heat radiating plate 4 is directly screwed to the metal housing 1. Any fixing method may be used.

  In the present embodiment, the transformer core of the power supply device has been described as having a configuration in which an I core is disposed at the top and an E core is disposed at the bottom. However, the core configuration is limited to such a configuration. For example, a configuration in which an E core is disposed in the upper portion and an I core is disposed in the lower portion, or a configuration in which the E core is disposed in the upper and lower portions may be employed.

Embodiment 4 FIG.
FIG. 4 is an overhead view showing a transformer portion of the power supply device according to the fourth embodiment.

  In FIG. 4, the transformer of the power supply device includes a metal casing 1, an upper I core 2 that is a magnetic component of the transformer, a lower E core 3, a heat radiating plate 4, a holding spring 7, and a metal casing 1. And the support plate 8 for holding the heat-dissipating plate 4 and the holding spring 7, screws 9 for fixing the heat-dissipating plate 4 and the holding spring 7 to the support column 8, and a winding 10.

  The support plate 8 for holding the heat dissipation plate 4 and the holding spring 7 integrated with the metal housing 1 is provided with a pair of convex portions 13, and the heat dissipation plate 4 and the holding spring 7 pivot on the screw 6. As a result, rotation in the horizontal direction is prevented.

  In the present embodiment, the heat radiating plate 4 and the holding spring 7 are fixed to the column 8 using the same screw 9.

  With the above-described configuration, there is no need to fix the heat radiating plate 4 and the holding spring 7 using different screws, and the heat radiating plate 4 and the holding spring 7 are fixed using one screw 9. Therefore, the assembling property of the coil device such as the transformer of the power supply device is improved. In other words, by fixing the heat radiating plate and the holding spring to the metal casing with the same screw, the assembling property of the coil device such as the transformer and the coil of the power supply device is improved.

In addition, in the present embodiment, the attached portion of the heat radiating plate and the attached portion of the presser spring are arranged at the end portion on the opposite side of the metal housing in the common holding column integrated with the metal housing. The coil device is attached by a common attachment.
The heat radiating plate and the presser spring are fixed to the metal casing with a common screw.

  In this embodiment, the configuration of the core of the transformer of the power supply device has been described as a configuration in which the I core is disposed in the upper portion and the E core is disposed in the lower portion. However, the core configuration is limited to such a configuration. For example, a configuration in which an E core is disposed in the upper portion and an I core is disposed in the lower portion, or a configuration in which the E core is disposed in the upper and lower portions may be employed.

  Further, as in the second embodiment or the third embodiment, by providing a claw-like portion on the heat radiating plate 4 and fixing the upper I core 2 or the upper E core 3, it is possible to improve the assemblability.

Embodiment 5 FIG.
FIG. 5A is an overhead view showing a transformer portion of the power supply device according to the fifth embodiment.

  In FIG. 5A, the holding spring 7 has three arms in total, that is, two outer arms 14 and one middle arm 15. Other configurations are the same as those in the fourth embodiment.

  5B is an overhead view of the presser spring 7 when the presser spring 7 alone is removed from the heat radiation plate 4 integrated with the metal housing 1 and the support post 7 for holding the presser spring 7. FIG. Indicates.

  In FIG. 5B, a dotted line indicated by 17 is a line indicating the same height as the two outer arms 14, and the middle arm 15 is directed downward so that the pressing force is stronger than the outer arm 14. It is bent excessively.

  In the transformer of the power supply device as shown in FIG. 5A, the part where the temperature rises most is the upper surface of the upper I core 3 as described in the first embodiment. However, the upper surface of the upper I core 3 does not generate heat uniformly, but actually the temperature rises more near the center of the upper surface of the upper I core 3. This is because the temperature at the periphery of the upper surface of the upper I core 3 is lower than that near the center of the upper surface of the upper I core 3 due to heat radiation from the side surface direction of the upper I core 3 to the outside air.

  For the above reasons, in the transformer of the power supply device in which only the peripheral portion on the upper surface of the upper I core is pressed by the holding spring 7, the temperature near the center of the upper surface of the upper I core becomes high, which may hinder the miniaturization of the transformer. there were.

  In the present embodiment, the middle arm 15 is bent excessively downward so that the pressing force is stronger than the outer arm 14. Therefore, the heat radiating plate 4 and the upper I core 2 have higher adhesion near the center of the upper surface of the upper I core 2, and the vicinity of the center of the upper surface of the upper I core 2 is more efficient than the vicinity of the upper surface of the upper surface of the upper I core 2. Heat can be released.

  With the above configuration, a temperature increase near the center of the upper surface of the upper I core 3 can be suppressed, and a coil device such as a transformer of a small power supply device can be realized. In other words, by making the pressing force of the middle arm of the pressing spring stronger than the pressing force of the outer arm, it is possible to improve the heat dissipation near the center of the upper surface of the upper core. Coil devices such as transformers and coils can be realized.

Further, in the present embodiment, the pressing spring distributes the central portion of the heat radiating plate and the end portions on both sides thereof with a pressing force distribution in which the pressing force with respect to the central portion is larger than the pressing force with respect to the end portions on both sides. The coil device is characterized by being pressed against a surface of the second core that is far from the metal casing.
In addition, the holding spring has an arm-shaped portion that presses both ends and a center portion of the upper core against the housing, and the arm that presses the center portion of the upper core against the housing is the upper portion of the pressing spring. The coil device is characterized in that the amount of bending is larger than that of an arm pressing both ends of the core against the casing.
Further, the attached portion of the heat radiating plate and the attached portion of the holding spring are attached to the end of the common holding column integral with the metal casing on the side opposite to the metal casing by a common attachment. This is a coil device.

  Note that the transformer core of the power supply device described in this embodiment is preferably a transformer without a gap in the middle of the E core. If a core with a gap in the middle leg of the E core is used, the pressing force of the middle arm 15 is stronger than the pressing force of the outer arm 14, so that there is a possibility that the center of the I core 2 may be destroyed. is there.

  In the present embodiment, the configuration of the core of the transformer of the power supply apparatus has been described as a configuration in which the I core is disposed in the upper portion and the E core is disposed in the lower portion, but the core configuration is limited to such a configuration. Instead, for example, a configuration in which the E core is disposed in the upper portion and the I core is disposed in the lower portion, or a configuration in which the E core is disposed in the upper portion and the lower portion may be employed.

  Further, as in the second embodiment or the third embodiment, by providing a claw-like portion on the heat radiating plate 4 and fixing the upper I core 2 or the upper E core 3, it is possible to improve the assemblability.

Embodiment 6 FIG.
FIG. 6A is an overhead view showing a transformer portion of the power supply device according to the sixth embodiment.
In FIG. 6 (a), the presser spring 7 has two outer springs positioned on both sides of the heat sink plate 4 which are bent so that the vicinity of the center protrudes downward as will be described later. It has an arm 14. Other configurations are the same as those in the fourth embodiment.

6B is an overhead view of the presser spring 7 when the presser spring 7 alone is removed from the heat radiation plate 4 integrated with the metal housing 1 and the support post 8 for holding the presser spring 7. FIG. Indicates.
In FIG. 6B, the heat radiating plate 4 is bent so that the vicinity of the center is convex downward.

  In the transformer of the power supply device as shown in FIG. 6A, the portion where the temperature rises the most is the upper surface of the upper I core 3, and the temperature rises more in the vicinity of the center of the upper surface of the upper I core 3. This is as described in the fifth embodiment.

  For the above reasons, in the transformer of the power supply device in which only the peripheral portion on the upper surface of the upper I core is pressed by the holding spring 7, the temperature near the center of the upper surface of the upper I core becomes high, which may hinder the miniaturization of the transformer. there were.

  In the present embodiment, the heat radiating plate 4 is bent so that the vicinity of the center is convex downward. The heat radiating plate 4 is brought into close contact with the entire upper surface of the upper I core by pressing the peripheral portion with the pressing spring 7. At this time, the adhesion between the heat sink plate 4 and the upper I core 2 near the center of the upper surface of the upper I core 2 is higher than the periphery of the upper I core 2, Heat can be radiated more efficiently than the vicinity of the upper surface of the I core 2.

  With the above configuration, a temperature increase near the center of the upper surface of the upper I core 3 can be suppressed, and a coil device such as a transformer of a small power supply device can be realized. In other words, it is possible to improve the heat dissipation near the center of the upper surface of the upper core by bending so that the vicinity of the center of the heat radiating plate protrudes downward. Such a coil device can be realized.

  In the present embodiment, unlike the configuration described in the fifth embodiment, the vicinity of the center of the upper I core is not directly pressed by the holding spring 7 and is applied to a transformer having a gap in the middle leg of the E core. be able to.

Further, the present embodiment is characterized in that the center portion of the heat radiating plate is warped in the direction of the second core, and the pressing spring elastically presses both sides of the center portion of the second core. It is a coil device.
Further, the coil device is characterized in that a center portion of the heat radiating plate is warped in the direction of the upper core, and the holding spring has an arm-shaped portion that presses both end portions of the upper core against the casing.

  In this embodiment, the configuration of the core of the transformer of the power supply device has been described as a configuration in which the I core is disposed in the upper portion and the E core is disposed in the lower portion. However, the core configuration is limited to such a configuration. For example, a configuration in which an E core is disposed in the upper portion and an I core is disposed in the lower portion, or a configuration in which the E core is disposed in the upper and lower portions may be employed.

Embodiment 7 FIG.
FIG. 7 is an overhead view showing still another example of the configuration of the transformer part of the power supply device as an example of the coil device.
Further, as shown in FIG. 7, by providing a claw-like portion on the heat radiating plate 4 and fixing the upper I core 2 or the upper E core 3 so as not to move, the assemblability can be improved.

Further, in the present embodiment, the heat dissipation plate integrally includes a plurality of holding pieces for holding a plurality of locations on the side surface of the core surrounding the surface of the second core far from the metal casing. This is a coil device.
The holding piece also holds a plurality of locations on the side surface of the first core.
Further, the coil device is characterized in that a center portion of the heat radiating plate is warped in the second core direction, and the pressing spring elastically presses both sides of the center portion of the second core.
Further, the heat radiating plate uses a heat radiating plate whose central portion is warped in the direction of the upper core, and the holding spring has arm-shaped portions that press both sides of the central portion of the upper core against the housing. It is a coil device characterized by having.

Embodiment 8 FIG.
FIG. 8 is an overhead view showing a transformer portion of the power supply device according to the eighth embodiment.
In FIG. 8, the heat radiating plate 4 is provided with a concave recess 16 at the center. The recess 16 is formed by, for example, pressing. Other configurations are the same as those in the fourth embodiment.

  In the transformer of the power supply device as shown in FIG. 5A, the portion where the temperature rises the most is the upper surface of the upper I core 3, and the temperature rises more in the vicinity of the center of the upper surface of the upper I core 3. This is as described in the fifth embodiment.

  For the above reasons, in the transformer of the power supply device in which only the peripheral portion on the upper surface of the upper I core is pressed by the holding spring 7, the temperature near the center of the upper surface of the upper I core becomes high, which may hinder the miniaturization of the transformer. there were.

  In the present embodiment, the heat radiating plate 4 is provided with a concave recess 16 in the center. The heat radiating plate 4 presses the peripheral portion with a pressing spring 7. At this time, the adhesion between the heat sink plate 4 and the upper I core 2 in the vicinity of the center of the upper surface of the upper I core 2 is higher than that in the periphery of the upper I core 2. Heat can be radiated more efficiently than the vicinity of the upper surface of the I core 2.

  With the above configuration, a temperature increase near the center of the upper surface of the upper I core 3 can be suppressed, and a coil device such as a transformer of a small power supply device can be realized. In other words, it is possible to improve the heat dissipation near the center of the top surface of the upper core by providing a concave recess in the center of the heat dissipation plate, thereby realizing a coil device such as a small transformer or coil. Can do.

  In the present embodiment, unlike the configuration described in the fifth embodiment, the vicinity of the center of the upper I core is not directly pressed by the holding spring 7 and is applied to a transformer having a gap in the middle leg of the E core. be able to.

In addition, the present embodiment is characterized in that a center portion of the heat radiating plate is recessed toward the second core, and the pressing spring elastically presses both sides of the center portion of the second core. It is a coil device.
The coil device is characterized in that a central portion of the heat radiating plate is depressed in the direction of the upper core, and the pressing spring has arm-shaped portions that press both end portions of the upper core against the casing. It is.

  In the present embodiment, the configuration of the core of the transformer of the power supply apparatus has been described as a configuration in which the I core is disposed in the upper portion and the E core is disposed in the lower portion, but the core configuration is limited to such a configuration. Instead, for example, a configuration in which the E core is disposed in the upper portion and the I core is disposed in the lower portion, or a configuration in which the E core is disposed in the upper portion and the lower portion may be employed.

  Further, as in the second embodiment or the third embodiment, by providing a claw-like portion on the heat radiating plate 4 and fixing the upper I core 2 or the upper E core 3, it is possible to improve the assemblability.

In the present invention, each embodiment can be appropriately modified, omitted, or combined within the scope of the invention.
In addition, in each figure, the same code | symbol shows the same or an equivalent part. Further, in the description of each embodiment, overlapping description of the same or corresponding parts is avoided as much as possible for the sake of simplicity.

    1 metal housing, 2 upper I core (second core), 3 lower E core (first core), 4 heat dissipation plate, 5 strut (heat dissipating plate holding strut), 6 screw (heat dissipating plate attachment), 7 Pressing spring, 8 Post (pressing spring holding post) (Common holding post), 9 Screw (Pressing spring mount) (Common mount), 10 Winding, 11 Claw-shaped part (holding piece), 12 Convex part, 13 Convex part, 14 outer arm, 15 middle arm, 16 concave depression.

Claims (16)

Metal housing, first core thermally coupled to the metal housing, and second core thermally and magnetically coupled to the first core on the side far from the metal housing A core body built in the metal casing, windings wound around the core body and having the first core and the second core as magnetic paths, and the metal of the second core A heat dissipating plate that is in surface contact with the surface far from the housing, and a holding spring that elastically presses the heat dissipating plate against the surface of the second core far from the metal housing at the tip , The heat dissipating plate has better heat conductivity than the holding spring, the heat dissipating plate is fixed by a single heat dissipating plate mount, and means for preventing the heat dissipating plate from rotating about the heat dissipating plate mount is the heat dissipating plate. A car installed next to the mount Coil apparatus of use.   2. The coil device according to claim 1, wherein the holding spring partially presses the heat radiating plate against a surface of the second core far from the metal casing at a plurality of locations. .   3. The coil device according to claim 2, wherein a shape of the holding spring is a finger shape, and the heat radiating plate is pressed against a surface of the second core far from the metal casing at a tip portion thereof. Coil device.   4. The coil device according to claim 3, wherein the pressing spring distributes the central portion of the heat radiating plate and both end portions thereof with a pressing force distribution in which the pressing force with respect to the central portion is larger than the pressing force with respect to the end portions on both sides. A coil device, wherein the coil device is pressed against a surface of the second core far from the metal casing.   5. The coil device according to claim 1, wherein a portion to which the heat radiating plate is attached is attached to the metal casing. 5. The coil device according to claim 1, wherein the attached portion of the heat radiating plate is an end of the heat radiating plate holding column integral with the metal housing opposite to the metal housing. 6. A coil device, wherein the coil device is attached to the part by a heat radiating plate attachment.   The coil device according to any one of claims 1 to 6, wherein the attached portion of the heat radiating plate is one portion of an end portion of the radiating plate, and the pressing spring is the attached portion of the radiating plate. The coil apparatus characterized by being located in the edge part on the opposite side.   The coil device according to any one of claims 1 to 7, wherein a portion to which the presser spring is attached is attached to the metal casing.   The coil device according to any one of claims 1 to 7, wherein the attached portion of the presser spring is an end of the presser spring holding column integral with the metal housing opposite to the metal housing. A coil device, wherein the coil device is attached to the portion by a holding spring attachment.   5. The coil device according to claim 1, wherein the attached portion of the heat radiating plate and the attached portion of the pressing spring are made of the metal in a common holding column integrated with the metal casing. A coil device, wherein the coil device is attached to an end opposite to the housing by a common attachment.   10. The coil device according to claim 1, wherein the heat dissipating plate holds a plurality of locations on a side surface of the core that surrounds a surface of the second core far from the metal casing. A coil device characterized by integrally having a holding piece.   The coil device according to claim 11, wherein the holding piece also holds a plurality of locations on a core side surface of the first core.   10. The coil device according to claim 1, wherein the heat radiating plate covers the entire surface of the second core on the side far from the metal casing. 11. Coil device.   14. The coil device according to claim 13, wherein the heat dissipating plate is in surface contact with the entire surface of the second core remote from the metal casing.   14. The coil device according to claim 1, wherein a central portion of the heat radiating plate is warped in a direction of the second core, and the pressing spring is formed on the central portion of the second core. A coil device characterized by elastically pressing both sides.   14. The coil device according to claim 1, wherein a central portion of the heat radiating plate is recessed toward the second core, and the pressing spring is provided at the central portion of the second core. A coil device characterized by elastically pressing both sides.

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